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DAC3283 Arkusz danych(PDF) 6 Page - Texas Instruments

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Numer części DAC3283
Szczegółowy opis  Wideband Transmit-Receive Digital Signal Processors
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Strona internetowa  http://www.ti.com
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GC5330
GC5337
SLWS226 B
– DECEMBER 2010 – REVISED JANUARY 2011
www.ti.com
The RX path can be configured for one or two multichannel ADC input ports. The RX block provides each ADC
channel with a front-end AGC, IQ demodulation correction, real-to-complex conversion, complex mixing,
decimation, and complex equalization. The RX block output is input to the DDUC block. The output of the DDUC
block goes through gain and back-end AGC and is formatted for the baseband output.
There are four DDUC blocks. Each can be used for the RX DDC downconversion or TX DUC upconversion, one
at a time. The DDUC has a complex mixer, cascade integrator comb filter, resampler, and a programmable FIR
filter. Each DDUC can support 1 to 12 channels.
The TX path can be configured for one, two, or four antenna streams. In addition, with one or two antenna
streams, an envelope modulator output is available. The DAC and envelope modulator share the same output
ports. The TX input is from the baseband input, through the DDUC to create complex antenna streams. The CFR
block provides for gain adjustment, peak reduction, and peak limiting. The CFR block peak power reduction and
follow-on circular limiter provide the headroom to apply the DPD correction, and to lower the peak power results
for more power amplifier efficiency. Additional interpolation stages after CFR expand the antenna stream
bandwidth to the DPD bandwidth.
The DPD has both high-performance (more correction) and high-bandwidth (more bandwidth) modes. The
high-bandwidth mode supports 62 MHz {74 MHz} for one or two antenna streams, and 31 MHz {37 MHz} for four
antenna streams with fifth-order expansion bandwidth. The high-performance mode supports one antenna at 62
MHz {74 MHz}, two antennae at 31 MHz {37 MHz}, or four antennae at 15.5 MHz {18.5 MHz}. The GC533x DPD
processor provides phase correction, gain correction, and nonlinear feedforward correction for each TX stream.
The spectral emission or ACP performance is improved by 20 dB or more.
Specialized capture logic collects the RX input, feedback input, RX output, DPD input, and DPD output for the
DSP processor to perform the adaption algorithm. The capture logic can also be used for performance
monitoring and power measurement.
AVAILABLE OPTIONS
PART NUMBER
TC
PACKAGE
THERMAL PROPERTIES
GC5330IZEV
–40°C to 85°C
484 ball 23-mm
× 23-mm PBGA
Heat transfer through package top
GC5337IZEV
–40°C to 85°C
484 ball 23-mm
× 23-mm PBGA
Heat transfer through package top
6
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© 2010–2011, Texas Instruments Incorporated
Product Folder Link(s): GC5330 GC5337


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